ADT7473ARQZ-1R7 ON Semiconductor, ADT7473ARQZ-1R7 Datasheet - Page 72

• Manufacturer Part Number: ADT7473ARQZ-1R7
• Description: IC THERM MON FAN CTLR 16-QSOP
• Manufacturer: ON Semiconductor
• Series: dBCool®r

Specifications of ADT7473ARQZ-1R7

• Function: Fan Control, Temp Monitor
• Topology: ADC, Comparator, Fan Speed Counter, Multiplexer, Register Bank
• Sensor Type: External & Internal
• Sensing Temperature: -40°C ~ 125°C, External Sensor
• Output Type: SMBus™
• Output Alarm: No
• Output Fan: Yes
• Voltage - Supply: 3 V ~ 3.6 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 16-QSOP
• Full Temp Accuracy: +/- 0.5 C
• Digital Output - Bus Interface: Serial (3-Wire, 4-Wire)
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Table 56. Register 0x7C — Configuration Register 5 (ADT7473Power−On Default = 0x00)
1. This register becomes read−only when the Configuration Register 1 lock bit is set to 1. Any further attempts to write to this register have
Table 57. Register 0x7D — Configuration Register 4 (Power−On Default = 0x00)
1. This register becomes read−only when the Configuration Register 1 lock bit is set to 1. Any further attempts to write to this register have
Bit No.
Bit No.
[1:0]
[0]
[1]
[2]
[3]
[4]
[5]
[6]
[7]
[2]
[3]
[4]
[5]
[6]
[7]
no effect.
no effect.
Temp Offset
R1 THERM
R2 THERM
Max/Full on
BpAttV
Mnemonic
Hysteresis
Mnemonic
Pin9FUNC
COMPL
THERM
THERM
THERM
THERM
THERM
Disable
GPIOD
GPIOP
TWOS
Config
Local
RES
RES
RES
RES
CCP
R/W (Note 1)
R/W (Note 1)
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Twos complement = 1, sets the temperature range to twos complement temperature range.
Twos complement = 0, changes the temperature range to Offset 64. When this bit is
changed, the ADT7473/ADT7473−1 interprets all relevant temperature register values as
defined by this bit.
TempOffset = 0 sets offset range to ±64°C at 0.5°C resolution.
TempOffset = 1 sets offset range to ±128°C at 1°C resolution.
GPIO direction. When GPIO function is enabled, this determines whether the GPIO is an
input (0) or an output (1).
GPIO polarity. When the GPIO function is enabled and is programmed as an output, this bit
determines whether the GPIO is active low (0) or high (1).
Reserved on the ADT7473 On the ADT7473−1:
R1 THERM = 1, THERM temperature limit functionality enabled for Remote 1 temperature
channel; that is, THERM is bidirectional. R1 THERM = 0, THERM is a timer input only.
THERM can also be disabled on any channel by:
Local THERM = 1, THERM temperature limit functionality enabled for the local temperature
channel; that is, THERM is bidirectional. Local THERM = 0, THERM is a timer input only.
THERM can also be disabled on any channel by:
R2 THERM = 1, THERM temperature limit functionality enabled for Remote 2 temperature
channel; that is, THERM is bidirectional. R2 THERM = 0, THERM is a timer input only.
THERM can also be disabled on any channel by:
These bits set the functionality of Pin 9.
THERM Disable = 1, disables THERM overtemperature output features.
Max/Full on THERM = 0; when THERM temperature limit is exceeded, fans go to full speed.
Max/Full on THERM = 1; when THERM temperature limit is exceeded, fans go to maximum
programmed fan speed.
Max/Full on THERM = 1; when THERM limit is exceeded, fans go to maximum speed as
defined in Register 0x38, Register 0x39, Register 0x3A.
Unused on ADT7473. On the ADT7473−1:
Bypass V
0 V (0x00) to 2.2965 V (0xFF).
Reserved
Reserved
0 = THERM hysteresis disabled
1 = THERM hysteresis enabled
Writing −64°C to the appropriate THERM temperature limit in Offset 64 mode.
Writing −128°C to the appropriate THERM temperature limit in twos complement mode.
Writing −64°C to the appropriate THERM temperature limit in Offset 64 mode.
Writing −128°C to the appropriate THERM temperature limit in twos complement mode.
Writing −64°C to the appropriate THERM temperature limit in Offset 64 mode.
Writing −128°C to the appropriate THERM temperature limit in twos complement mode.
00 = TACH4 (default)
01 = THERM
10 = SMBALERT
11 = GPIO
0 = Remote Channel 2 (default)
1 = Remote Channel 1 and Remote Channel 2
CCP
attenuator. When set, the measurement scale for this channel changes from
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72
Description
Description